DescriptionCounterbore – HSS Straight Shank – Various SizesHigh speed steel straight shankUsed for drilling recessed holes into scales for Corby Bolts, Gulso Bolts, screws etc.Counterbore pilots must be purchased separately. Uses a 1.5mm allen wrench.Selection Guide:For Corby bolts: 3/16″ uses Counterbore #CB1 with Pilot #PIL1 1/4″ uses Counterbore #CB2 with Pilot #PIL2 5/16″ uses Counterbore #CB3 with Pilot #PIL3For Gulso Bolts: 1/4″ uses Counterbore #CB2 with Pilot #PIL5 5/16″ uses Counterbore #CB3 with Pilot #PIL2 3/8″ uses Counterbore #CB4 with Pilot #PIL4Sold as each
