Packaging: 8 stop collars (one piece per size) and 1 wrench included. Function and benefits - Precision depth stops: shaft rings act as exact depth controls on machines, helping to prevent excessive drill penetration and improve hole consistency. - Broad compatibility: suitable for use with twist drills and point drill bits to protect tools and workpieces. - Axial fixation: pressure rings provide reliable axial support to fix components in place and maintain normal system operation. - Durable build: crafted from high-quality steel, designed for heavy use and long service life. Construction and materials - Material: high-quality steel - Design: stop cuffs built for heavy-duty applications Use scenarios - Drilling depth control: set a defined drilling depth on twist drills to avoid over-penetration and ensure uniform hole depth. - Precision fabrication: use with point drill bits in fixture setups to maintain consistent depth and alignment. - Mechanical assemblies: apply as axial fixators in assemblies to secure components and prevent loosening during operation. Compatibility and performance - Includes 8 sizes (one piece per size) and a wrench for immediate installation and adjustment. - Designed for engineering, manufacturing, and construction environments where precision depth control and axial fixing are required.