Powertec Drill Bit Stop Collar Kit With Imperial System Size Markings - 7, 71491 Introducing the 7-Piece Drill Bit Stop Collar Set by POWERTEC. This impressive collection of bit stop collars create the perfect drill holes with high precision and uniform depth for your portable drilling and woodworking applications. They feature a split ring design used to control the depth of the hole you are drilling ? eliminating over under drilling. This also helps to provide a secure, dependable grip around the diameter of your drill bit ? delivering quick and easy utility. Premium Design Each collar is made with heavy duty steel for long-term durability. They will not mar your expensive drill bits as they never touch the bits. Unlike other brands, we have wisely marked each stop for easy bit identification and enhanced workflow. These stops can 7pc Set Contains 1/8 inch bit stop collar 3/16 inch bit stop collar 1/4 inch bit stop collar 5/16 inch bit stop collar 3/8 inch bit stop collar 7/16 inch bit stop collar 1/2 inch bit stop collar INCLUDED BONUS: An Allen Wrench is supplied to help adjust and install/uninstall the stop bits and can also be used for other projects. POWERTEC is a leading manufacturer of high quality woodworking tools and accessories, machines, and an assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the latest innovations, technology, and product development to the industry. INCLUDES: 7 Piece Split Ring Stop Collar Set (Assorted Sizes) and (1) Allen Wrench to tighten stops FEATURES: Marked sizes for easy bit identification and optimal workflow; Plus a split ring design that allows accurate control of depth for the hole to be drilled, making these drill bit depth stop collars ideal for professionals and DIY enthusiast doing production work or repeated drilling projects FUNCTION: For portable drill applications that require perfect, high precision holes with uniform depth SIZES: We?ve packaged seven of the most common and requested stops for drill bit sizes 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2 inch PREMIUM QUALITY: Each bit collar is constructed out of heavy duty solid steel for long term durability, a secure tightened fit, and a non-marring profile that will not dame your drill bits