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MCKAY ONCE AGAIN FEATURING AN ITEM EXCLUSIVELY FOR YOU!" McKay 7 Piece, Error-Free Shaft Collar Set AKA Set Screw Style Drill Stop Collar"Introducing: Precision drilling couldn't be simpler with our set screw style shaft collar set. Just set the stopping point of the drill shaft and the ring will stop the power tool from working at the exact set point of the stop bit.Envisioned utilization's:Ideally used for lumber/wood, woodworking, metal and, abrasive concrete or masonry; power drills, drill presses & gears.Significant Quality: Our collars were constructed with sturdy metal steel material for a more durable & tougher working experience.Includes: The following 7 drill stop ring sizes are included in the package; adjust the ring according to the shaft size width. 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", ½'. Package also includes a hex key to adjust the tightening of the set screw.