28 Piece Transfer Punch Set is 3/32-1/2″ by 64ths and 11/32″. ~ 25 Piece Transfer Punch Set is 1-13mm x 0.5mm. ~ Undersize .0025″. ~ Heat treated tempered tool steel for longer life. ~ Black oxide finish. ~ 4-7/8″ long. ~ Used for transferring of threaded, drilled and tapped holes. ~ Supplied with stands. Supplied with stands. Undersize .0025″. Heat treated tempered tool steel for longer life. Black oxide finish. Used for transferring of threaded, drilled and tapped holes.