Stop Collars for Drill Bit/Countersink/Counterbore Units

Use in combination with our countersinks/counterbores to set the unit for a wide range of screw lengths for everything from flush countersinking to a full 1/2" of counterbore. The 3/8” stop collar works for #5 to #9 screws, and the 1/2" stop collar works for #10, #12 and #14 screws. Also available in boxed sets with taper drill bits, stop collars and hex keys.