MARTIN YALE Hollo Drill Bits Standard Style J up to 9/32in & Style K Upto 5/16in(notallsizes)

MARTIN YALE Hollo Drill Bits Standard Style J up to 9/32in & Style K Up to 5/16in(not all sizes)
These superior grade bits, standard or ordered with the exclusive
Diamonizing Process, provide clean, smooth drilling. Hollow drill
bits resist chipping, twisting and clogging. Chromium, vanadium
and molybdenum combine to create long-lasting and depend-
able tools. Seven styles are available in vertical capacities from
1" to 2/2" and 12 hole sizes from /8" to /2" diameter. The optical
Finishing EquipmentDiamonizing Process impregnates the steel with tungsten carbide
to make the bit 90% the hardness of diamond. The resulting bit
lasts up to four times as long.