• Highlight: MK Diamond MK-290GW 1-3/8" wet-cutting bit designed specifically for granite and engineered-stone core holes.
• Best For: Stone fabricators boring faucet, soap-dispenser, and air-gap holes through granite and quartz countertops.
• Expert Note: Wet-feed cooling extends bit life on dense stone; the premium grade matrix delivers chip-free entry and a clean exit on the underside.
