Please kindly noted that this item is sold by jindouyunshanghai from Joybuy marketplace. Parts List: 1×30-34mmx20mm Drill Depth Stop Collar 1×49-54mmx28mm Drill Depth Stop Collar Detailed description: Product Name: Drill Depth Stop Material: Aluminum Alloy Product Size: 0.78inch width, 1.1inch width Color: Red Notes: 1.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 2.Please allow slight dimension difference due to manual measurement. [Premium Aluminum Alloy Material] Our drill depth stop is made of high quality aluminum alloy material, which has high hardness, wear resistance and high temperature resistance. It has strong fixation and durable to use. [Adjustable Inner Diameter] The package includes 2pcs drill depth stops, 30-34mmx20mm and 49-54mmx28mm, which can adjust inner diameter to adapt to different sized drill bits. It is suitable for large drill widths 15/64inch-7/16inch (0.23inch-0.43inch), suitable for small drill widths 5/64inch-3/16inch (0.078inch-0.18inch). [Precise Control Drilling Depth] This drill depth stop can precise control drilling depth without damage drilling bit. The nylon inner ring is easy to lock and not loosen, avoid wear of the locking part of the drill bit. This kit is suitable for DIY lovers and professionals. [Wide Application] 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.