The sleeve is by -MO, which is durable, high in hardness and not easy to be damaged. Various specifications and wide application, which can cope with a of working environments. Surface rust-proof treatment, rust-proof, corrosion-resistant and durable. The reverse spiral groove is designed to to provide maximum grip. Broken wire extractor, used for pipe breaking, decapitation, thread sliding and screw removal of water pipes. Name:nut and bolt extractor set Quantity:26pcs/set Colour:Silver Material:Metal Package Contents: 13 * nut extractor (about 29mm in length) 6 * twist drill 6 * broken wire extractor 1 * conversion head (3/8 to 1/4) 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.