Features: Our drill depth stop craft from quality aluminum, which have highly hardness, wear resistance and highly temperature resistance. It have strong fixation and durability to use. The package includes 2pcs drill depth stops, 30-34mmx20mm and 49-54mmx28mm, which can adjust inner diameter to adapt to different sized drill bit. This drill depth stop can precise control drilling depth without damage drilling bit. The nylon inner rings is easy to lock and not loosen, avoid wear of the locking part of the drill bit. This kit is suitable for lovers and professional. Quick to adjust and precise control drilling depth, help work more convenient. It is suitable for furniture installation, general tile, wood, metal, plastic and brick. Specifications: Component:Aluminum Length:Approx.4.9cm/1.93inch;3cm/1.18inch; 3cm Drill Depth Stop Applicable Drill Size:Approx.5/64inch-3/16inch; 4.9cm Applicable Drill Size:Approx.15/64inch-7/16inch; Package Includes: 1pc 30-34mmx20mm Drill Depth Stop Collar 1pc 49-54mmx28mm Drill Depth Stop Collar note: Please allow 1-2cm errors due to manual measurement,please make sure that you donot mind befores you order. Due to the differences between different monitors, the picture may not reflect the actual item color.