Achieve accurate and repeatable drilling depths with this 8-piece Drill Bit Depth Stop Collar Set . Designed for professional, workshop, and DIY use, these adjustable collars help prevent over-drilling and under-drilling when making multiple holes at a consistent depth. Each collar can be positioned along the drill bit flute or smooth shaft and tightened securely for dependable performance. The split-ring design provides stronger, more even clamping than many standard single set-screw collars, helping the stop remain in place during use. Made from lightweight, durable aluminum, this assortment includes eight commonly used fractional sizes for a wide range of drilling projects. Features 8-piece adjustable drill bit depth stop collar set Helps produce consistent and repeatable hole depths Reduces over-drilling and under-drilling Quick adjustment along drill bit flutes or shafts Split-ring collar design for secure holding Manufacturer states up to 5 times the holding power of standard set-screw designs Lightweight, durable aluminum construction Suitable for woodworking, metalworking, masonry, concrete, and general drilling Useful for professionals, contractors, woodworkers, and DIY projects Included Sizes 1/2"" 7/16"" 3/8"" 5/16"" 1/4"" 7/32"" 3/16"" 1/8"" Package Includes 8 Aluminum Drill Bit Depth Stop Collars Adjustment Tool, if included by the manufacturer Please verify your drill bit diameter before selecting and installing the appropriate collar