Features: 1.With a positive and negative ratchet switch, it can rotate forward and reverse, and quickly loosen and tighten the drill chuck, which is simple and convenient. 2.Made of high quality steel, wear resistant and has a long service life. 3.Two sizes help you work perfectly. Small head diameter: 12.7mm, big head diameter: 17.5mm. 4.The handle is non-slip and comfortable to hold. 5.Use to tighten or loosen the chuck. Perfect for most electric drills and power tools. The ratchet function makes changing the drill bit more efficient. Specification: Material: 45# steel + rubber Colour: Black Weight: about 104g Diameter of both ends: small head: about 12.7mm, big head: about 17.5mm. With positive and negative ratchet switch Length: Full length: about 150mm PackageList: 1 pcs 2 in 1 Drill Chuck Ratchet Spanne Note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.