Omega Products Back Stop Screws are essential accessories designed specifically for ER collet chucks. They provide reliable support and precise positioning for workpieces, helping you achieve consistent machining results. Designed for ER11 systems with M6 threads, these screws combine durable construction with a secure locking mechanism to maintain accuracy through repeated cycles. The ergonomic design makes setup quick and locking secure, reducing downtime and helping you maintain tight tolerances across a range of materials and operations. ER11-compatible M6 threading: Fits ER collet chucks with M6 back stop screws, ensuring a secure fit and reliable positioning every time. Precise threads with secure locking: Precision machining threads paired with a robust locking mechanism keep the workpiece in the exact position you set, minimizing runout and boosting part consistency. Durable, wear‑resistant construction: Built from high-quality materials to withstand repeated clamping and machining cycles, delivering long service life even in demanding environments. These back stop screws help stabilize the workpiece, speed up setups, and improve overall machining performance. By providing a repeatable stop position with easy adjust-and-lock operation, they reduce downtime and support tighter tolerances in drilling, milling, and finishing tasks across a variety of applications.