new unused Used to fix on drill bits of Location Precisely control the drilling depth and unify the drilling depth. The drill bit limit ring set can accurately control the drilling depth without damaging the drill bit Adjustable Range: inner diameter of the 2 installed drill depth stops can be adjusted to 3-5mm,5-8mm,8-13mm Product Name: Adjustable Drill Stop Collar Size:3-5mm,5-8mm,8-13mm Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:plastic Package Contents: 3 x Adjustable Drill Stop Collar 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.