1. The drill bit needs to be fully inserted to the bottom and cannot be clamped in place. 2. Before use, it must be locked tightly before use, otherwise it may slip and damage the claws. 3. It is prohibited to clamp the milling cutter; Milling cutters are generally subjected to force during face milling and side milling, while drilling chucks cannot withstand force during side milling. 4. Prohibit clamping hinge force; The hinge force requires high accuracy, sometimes requiring hole expansion and edge grinding, resulting in side stress. The drill chuck cannot achieve high accuracy and cannot withstand side stress. 5. Prohibit clamping polygonal handles; The drill chuck can only hold the round handle and vertically processed cutting tools. If the force is uneven, the claws are easily damaged Colour:As Shown Material:Metal Package Contents: 1 x drill chuck collet tool 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.