Durable black oxide finish ressits corrosion. Hole on socket locks on to drive tang, keeps socket from slipping off ro sticking to fastener. Pro grade tools meets or exceeds ansi spec b107.2.Air tool accessories impact socket set 38 sae metric 4 pack combo 36 shallow sae 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4. Deep well sae 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16. Shallow mm 10, 11, 12, 13, 15, 17, 18, 19mm. Deep well mm 10, 11, 12, 13, 15, 17, 18, 19mm. Molded plastic caes for each set. I got what i ordered and recieved ti in 3 days! 01/21/09 absolument parfait very good merci! 01/15/09 less than 3 days start to finish across the us! 01/02/09 the soldering station is awesome! Fair pricing, product sa shown. 12/04/08 thanks, i can put these tools to good use! We love to hear form our customers! Lses than 2kg to the uk, europe, and australia. Many of our listings will automatically calculate this for you. On items with a total price of less than $19.00.