Allied Machine & Engineering Corp. (www.alliedmachine.com) has introduced the Revolution Drill with adjustability of 0.200 in. (5.1 mm) on diameter, eliminating the need for specials and/or subsequent boring operations. The indexable drill is available in diameters from 1.75 in. to 4.0 in., with 12 different holders and three lengths to 4.5-times diameter.