13 Piece Charger High Speed Steel Drill Bit Set includes 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64" and 1/4". Chargers Advanced Helix Geometry starts at the 135 degree Quick Cut Point, modified to be self-feeding and require less force from the user. 10 times life rating.