Steel Dragon Tools 1/4" x 4" Pilot Pin for 2" Depth HSS Annular Cutters Steel Dragon Tools 1/4 in. x 4 in. pilot pin for use with 2-inch cutting depth HSS annular cutters. Fits Steel Dragon Tools AC1 annular cutters with 2-inch cutting depth. Pilot pin helps locate center of hole location. Pilot pin helps eject slug after drilling is complete. During the drilling process, the pilot pin will retract into the cutter allowing lubrication.