1-9/16" X 7/16" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number: 75C450SHB307G

Part Number: 75C450SHB307G

Part Number: BIT-DWDCOJ

Part Number: assortment-kit-550904 Pieces - Coarse Thread

Part Number: Assortment Kit #213574 Pieces - Fine Thread

1-9/16" X 7/16" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number: 75C450SHB307GProduct Description Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and