Get accurate, correctly aligned pillar bedding holes in less time with your electric hand drill. Piloted forstner bit cuts straight and clean; opens up the existing stock screw holes to accept the most commonly used, 9/16" diameter bedding pillars. Mfg: Brownells SPECS: Steel, blue. Bit – 5" (12cm) long, 9/16" (14mm) diameter, 1/2" (12mm) diameter shank. Pilot – 1 1/2" (3.8cm) long, .312" (7.9mm) dia.