Drill-Bit Multi-Purpose 1/4" x 4.250"

Up to 3 to 4 times stronger than the typical single purpose bit. Cuts through masonry, ceramic tile, concrete, fiberglass, plexiglass, glass, cast-iron, hardened steel, granite, marble, and wood. Negative back grinding enables tip to bore through materials with a filling action. Designed for rotary or percussion drilling. Cobalt and tungsten carbide drill bit tip designed for maximum hardness and resistance to heat (up to 1900 F.) and wear. Chrome vanadium steel shank. Carded. Model No. 01075 and 01080 packed in convenient tube.No. 01010: 1/8" x 3", cardedNo. 01012: 5/32" x 3", cardedNo. 01020: 3/16" x 3-1/2", cardedNo. 01022: 7/32" x 3-3/4", cardedNo. 01030: 1/4" x 4-1/4", cardedNo. 01032: 9/32" x 4-3/8", cardedNo. 01040: 5/16" x 4-1/2", cardedNo. 01050: 3/8" x 5-3/16", cardedNo. 01060: 7/16" x 6", cardedNo. 01070: 1/2" x 6", cardedNo. 01075: 9/16" x 6", tubeNo. 01080: 5/8" x 6", tube