Allen key: Black Allen keys are

Black Allen keys are made from Chrome Vanadium Steel which withstand upto 30% higher torque as compared to Allen keys made Carbon Steel. TAPARIA Black Allen Keys are scientifically hardened to 52 to 56 HRC. AGRICO TATA 9-Piece Allen Key Set, Steel Hexkey Set In Plastic Box Ideal for Repair & Maintenance for Home & DIY Use 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10 -Sizes in mm ... Buy TAPARIA KM9V Allen Key Set for Rs.339 online. TAPARIA KM9V Allen Key Set at best prices with FREE shipping & cash on delivery. Only Genuine Products. 30 Day Replacement Guarantee. Learn about the origin and evolution of hex keys, also known as Allen wrenches, for bolts and screws with hexagonal sockets. Compare different designs, sizes and brands of hex keys and their applications.