steel knife sharpener
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 Master Cutlery HK-106320 Outdoor Fixed Blade Knife, 7.5-Inch Overall List Price: Sale Price: $4.95 You save: $0.61 (11%)  Eligible for free shipping!Availability: Usually ships in 1-2 business days DescriptionThis is the Mini Full Tang Survival Knife Magnesium Fire Starter. The Blade of the knife has been constructed from 440 Stainless Steel with a tanto point. The sheath is tough green nylon with a belt loop...  |
 Set 3 Ninja Stealth Black Throwing Knives with Nylon Case List Price: Sale Price: $6.85 You save: $18.14 (73%) Eligible for free shipping!Availability: Usually ships in 24 hours DescriptionThe set of three throwing knives comes with a case that you can keep them in. Carry on your belt or in your backpack. When camping, bust them out and practice learning your new skill 6.5-Inch overall (knife) Set of three knives black nylon sheath included circle loop on the end of the knife. |
 Smith & Wesson CKSUR1 Bullseye Search and Rescue Fixed Blade Knife List Price: Sale Price: $23.53 You save: $16.37 (41%) Eligible for free shipping!Availability: Usually ships in 24 hours DescriptionThe Smith & Wesson Bullseye Search and Rescue Fixed Blade Knife has a 5.88-inch modified point blade made of nearly indestructible 440 stainless steel, and the knife measures 10.5 inches in total length... |
 Lansky 8" Ceramic Sharp Stick List Price: Sale Price: $8.99 You save: $3.96 (31%) Eligible for free shipping!Availability: Usually ships in 1-2 business days DescriptionUpdated version of a Butcher's Steel featuring space age alumina ceramic 8" sharpenig rod in a hardwood handle |
 11" Full Tang Fire Starter Hunting Camping Knife W/flint List Price: Sale Price: $3.75 You save: $5.20 (58%) Eligible for free shipping!Availability: Usually ships in 1-2 business days DescriptionThis is the Full Tang Survival Knife with Magnesium Fire Starter. The Blade of the knife has been constructed from 440 Stainless Steel with a tanto point and serrated spine. The knife includes a magnesium rod fire starter... |
 Swiss Army Knives 40980 Pocket Sharpening Steel with Brass Handles List Price: Sale Price: $8.99 You save: $8.01 (47%) Eligible for free shipping!Availability: Usually ships in 3-5 weeks DescriptionSwiss Army Knives - Pocket Sharpening Steel with Brass Handles. Model: VN40980. 2 3/4" sharpening rod with brass handle and black composition casing with pocket clip. Hang packaged. |
 Gerber 31-000751 Bear Grylls Survival Series Ultimate Knife, Serrated Edge List Price: Sale Price: $31.99 You save: $48.00 (60%) Eligible for free shipping!Availability: Usually ships in 1-2 business days DescriptionFrom Gerber, the 31-000751 Bear Grylls Survival Series Ultimate Knife is designed to help you endure in the toughest environments. It features an ergonomic grip for comfortable handling and a dependable stainless steel blade with a versatile serrated edge... |
 Gerber LMF II ASEK Survival Knife List Price: DescriptionThe Gerber® LMF® II ASEK survival knife is an extremely tough military survival knife with a 4.84-in 420 HC stainless-steel blade and a rugged nylon handle that's designed to absorb shock. The versatile design features a plexiglass punch on the end of the handle and rope holes for converting it to a spear... |
 Smith & Wesson SWFRS First Response Serrated Knife List Price: Sale Price: $13.58 You save: $13.04 (49%) Eligible for free shipping!Availability: Usually ships in 1-2 business days DescriptionThe ComboEdge blade measures 3.3 inches in length; the overall length is 8 inches. The blade material is 440 carry while the handle is made of stainless steel and G10. It has a liner lock, a pocket clip, and is ideal for use as a glass breaker and seatbelt cutter in accident and other emergency situations. |
Why do some people feel extremely uncomfortable when they see someone scratch a glass-sheet with their nails?
Others have the same sensation(discomfort or even distress)seeing someone sharpen a knife with a steel-rod sharpener,and other similar activities.Does this concept have a name?what's the scientific explanation for this phenomenon?
Probably the sound frequency is a bit high... Like when you hear something screech... High frequency sounds always cause uncomfortable behavior in humans, according to tests, this is no different
