DescriptionMade of 45#steel material, it has high durability. This 2 in 1 drill chuck ratchet spanner can be used to control the tightness of electric drill clamping tools. Besides, there are two types key's diameter, portable for daily use. Features-Color: Black.-Material: 45#steel.-Size: About .00X2.00X1.20cm/5.89X0.79X0.47in.-Key diameter: small head 12.7mm/0.5in, big head 17.5mm/0.68in.- Features the 45#steel material, which has high durability, not easy to deform. - The double-head design is suitable for most drill chuck, and the ratchet function makes you to work faster.- Combinations of forward and reverse ratchet wrenches, saving time and energy.- The wrench's ratchet function makes changing the drill bit more efficient.- The ratchet spanner is widely used in mechanical maintenance, repair, car fix and repair.1 x drill chuck key wrench