Drill Stop Bit Collar Set Includes 8 collars (one piece per size): 1/8 inch, 3/16 inch, 7/32 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch. Packaging: 8 drill depth stoppers and 1 wrench included. Performance: Stop collars provide accurate positioning and stronger holding force to prevent bit creep during drilling. Precision control: Drill press depth stop ensures precise and consistent drilling depth for improved processing quality. Size range: covers common drill bit sizes from 1/8 inch to 1/2 inch. Use scenarios: Woodworking and cabinetry: achieve identical hole depths across multiple parts. Metal or plastic drilling: maintain uniform depths on batches of components. Fixture or jig setups: quick, repeatable depth stops for consistent results. Function and compatibility: designed as depth stops for drill bits used with drill presses to improve drilling accuracy and repeatability.