The Ratio-Cruciform^TM System allows you to build your own drilling system from 3/16" to 6" diameter. Make any length you need in diameters over 1 1/8". Ideal applications include drilling concrete, masonry, brick, hard aggregate, granite and marble.

Features include: CruciformTM Bits - The most economical drilling bit for rotary hammers. Forged steel bodies Drill diameters from 3/16" to 6" Adjustable drilling depth with adapters Self sharpened carbide studs Replaceable center drill cuts overall drilling costs New longer center drill for angle drilling Longer life with super tough carbide studs and CruciformTM design Efficient dust removal with replaceable flute Optional Core Bits or Hammer Bits

Components include: Adapters CruciformTM Drill Heads Heavy Duty Ratio CruciformTM Pilot Bits Extensions Flutes Core Bits Ratio Core Pilot Bits Hammer Bits Couplers