17/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore Shopify Collective the underside of the lid

the underside of the lid has a grid pattern that makes contact with the dividers

Part Number: 75C200HCSSS/316

Part Number: BIT-DEWSFC3/8-90

Diameters: 5/8"-11

Part Number: 75C475WA2Z

17/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore Shopify Collective the underside of the lidProduct 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