FTG USA Drill Bit Stop Collar Set made for FTG countersink drill bits for wood featuring 6 piece all same size 3/8", 1 piece 1/2", 1 piece Allen wrench 1/8". Drill Stop Collar Set was designed specifically for FTG countersink users, 6 Pc Same Size 3/8", 1 Pc 1/2", Hex Key 1/8". FTG countersinks need only 3/8" and 1/2" depth stops, and this set provides only these 2 sizes. Product is compatible with other countersink brands having similar design. Adjustable depth stop collars are used for consistent depth drilling and comes with plastic extendable tubular storage container. Hex Wrench (1/8" Allen key) is provided to install, uninstall, or adjust the depth stop collars on the 4-flute cutters of FTG countersinks tightening the 1/8" hex screw installed on the collar. The 6 piece drill stop collar 3/8" to be used with FTG countersink #4 (7/64"), #6 (9/64"), #8 (11/64"), #10 (3/16") and the 1/2" drill depth stop collar to be used with FTG countersink bit #12(7/32"), and #14(1/4"). FTG USA drill depth stop collar set made of carbon steel #45 for long lasting use. Black oxide coating enhances corrosion resistance. FTG adjustable collars allow to set the countersink depth for consistent drilling. Product designed, assembled and packaged in Bloomfield, New Jersey by Fair Trade Group USA and Professionally manufactured in China at FTG USA specs. Drill Stop Collar Set was designed specifically for FTG countersink users, 6 Pc Same Size 3/8", 1 Pc 1/2", Hex Key 1/8". FTG countersinks need only 3/8" and 1/2" depth stops, and this set provides only these 2 sizes. Product is compatible with other countersink brands having similar design