CRL 7/64" Fractional Sized 135º Split Point Jobber's Length High Speed Drill Bits All Purpose Cleaners & Protectors Sharpening or "dressing" of these

Sharpening or "dressing" of these drills periodically will substantially increase their cutting capabilities and minimize "glazing" or dulling of the bit

the glass will raise or lower accordingly

chimney or vent openings

If you are working with architectural surfaces such as these

PD Series Diamond Drills use a special diamond and brass bond for maximum performance in glass drilling

CRL 7/64" Fractional Sized 135º Split Point Jobber's Length High Speed Drill Bits All Purpose Cleaners & Protectors Sharpening or "dressing" of these135 Degree Split Point Tip Prevents Walking or Skating Fractional Sizes Jobber's Length Black Oxide Finish The CRL 135 Split Point Tip Drill Bits don't walk or skate when you first start to drill. These Bits are excellent for general purpose drilling into metal, wood, and plastics. Each Bit is made with a hot, roll formed flute, which is then heat treated to give additional toughness and durability. All Bits have a black oxide finish to resist