Forging with industrial-grade steel, integral heat treatment, higher hardness and impact resistance. Hexagon screw connection and concave groove design make it safer to prevent falling off. Fine polishing electroplating anti-slip knurling surface fine polishing treatment, bright chrome electroplating, knurling design to increase friction. supporting storage plastic boxes are practical and lightweight, and easy storage tools are not messy and more convenient to carry. Name: CR-V Cr-V steel sleeve Long version of 10pcs 1/4 inch: 5/6/7/8/9/10/11/12/13/14 mm. Colour:silver Material:steel Package Contents: 10 x 1/4 long hexagonal sleeve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.