toolant impact hex head allen wrench drill bits. Torsion zone to absorb torque peaks to avoid breakage. For impact driver and heavy screw driving. | 10pcs metric hex bits set-1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm. 1/4” quick release hex-shank, 4” long. | Extended length to meet more needs. 4 inch long hex bits is longer than the market ones, more practical and convenient. Extra length provide additional clearance for reaching into tight spaces. | CNC machined tips, S2 alloy steel body, hardened core to increase bit strength and reduce fracture. Manganese Phosphate surface to prevent rust. Strengthened magnetic impact bit helps you easy pick up screws. | Widely used in home repairs, automobiles and other screw driving applications. If you are not fully satisfied for any reason, please feel free to contact us via Amazon for 100% refund or replacement. Don’t forget to follow us on Amazon by clicking our brand name at the top of product page. :)