Milling Boring Head Set With Straight Shank 16mm Diameter 38mm (1.5") High Precision Boring Head for Milling Machine of Head Diameter 38 mm Supplied with straight shank ( 16mm) Head diameter - 38mm Capacity with vertical tool - 0-38mm Maximum boring diameter excluding tool - 60mm For tooling diameter - 8mm 1 Division: 0.015 mm Accepts 8 mm diameter tooling