Manufactured from chrome vanadium steel for strength and durability. Ball ends allow keys to turn fasteners at a slight angle for better access. Long side of key is balled end to allow better access and short side of key is a normal hex / Allen for high torque. Metric Sizes 1.5mm 10mm. Supplied in storage holder for easy storage and transportation. Storage hook on the holder for hanging up when not in use. Includes; (Long side length x short side length) 1.5mm Hex / Allen Key (90mm x 20mm) 2.0mm Hex / Allen Key (105mm x 20mm) 2.5mm Hex / Allen Key (115mm x 22mm) 3.0mm Hex / Allen Key (130mm x 25mm) 4.0mm Hex / Allen Key (145mm x 28mm) 5.0mm Hex / Allen Key (160mm x 32mm) 6.0mm Hex / Allen Key (180mm x 37mm) 8.0mm Hex / Allen Key (200mm x 45mm) 10.0mm Hex / Allen Key (230mm x 50mm)