Armeg PTC Drill Bit Accessories Features The drive adapter incorporates a water delivery system for crown cooling Small diameter water adapter for use with 3/16" to 3/8" crowns Large diameter water adapter for use with 1/2" to 4-1/2" crowns The pilot hole must be drilled with a 1/4" PTC Carbide Drill Bit Water Tank Pressure pump sprayer for water cooling of drill bits It has a thumb-operated locking spray handle attached to a 4" long flexible water feed tube Includes a shoulder strap and a 12" long water feed wand Capacity: 1 gallon Universal Water Feed Clamp Kit Universal clamp attaches the nozzle directly to the drill for a constant flow of water to the cutting edge, freeing both hands to control the drill Kit includes: depth stop, water feed connector, water feed tube, and clamp Use the Water Feed Adapter and the Water Feed Clamp Kit with the PTC Diamond Crown Drill Bits or PTC Carbide Drill Bits Piloting Guide Pads PTC Diamond Piloting Guide Pads ensure non-slip start-up of the 3/16" to 3/8" (5-10mm) PTC Diamond Crown Drill Bits