Specifications:Size: 1.5; 2; 2.5; 3; 4; 5; 6; 8; & 10mmLength of short arms: 14, 16, 18, 20, 25, 28, 32, 36, 40mmLength of long arms: 90, 100, 112, 126, 140, 160, 180, 200, 224mmMaterial: CR-V alloy steelHardness: HRC.50-57Package Size: 32 * 10 * 2.5cm / 13 * 4 * 1.1inPackage Weight: 457g / 1lb Features:1. The products are made of CR-V alloy steel and are processed with heat treatment so as to enhance their hardness and torsion ability.2. Easier to be plugged into screw cap with chamfered end.3. Nickle plated surface with antirust function.