This set includes the same Easy-Set stop collar and material thickness gauge/hex wrench that come with Kreg 300-Series Pocket-Hole Jigs.
The stop collar features a window that aligns with the engraved markings on the Kreg Easy-Set Pocket-Hole Drill Bit to make setting the bit at the correct depth easy for materials from 13 to 38 mm thick. The material thickness gauge allows you to easily determine the thickness of the material. The gauge has markings for 13 mm (½”), 19 mm (¾”) and 38 mm (1½”) material thicknesses. The built-in hex wrench allows you to tighten the stop collar.
The stop collar also fits all other standard (9.5 mm diameter) Kreg pocket-hole drill bits.