The Proto J4920FL Crowfoot Socket Wrench has a standard set by ASME B107.100-2010; SAE AS4984A.
.The Proto J4920FL Crowfoot Socket Wrench is a 12-point flare nut crowfoot wrench that can be used for both tightening and loosening nuts. 3/8" Drive, 5/8 in SAE Crowfoot Socket Wrench, 12 point When you need to tighten or loosen nuts in hard to reach places, the Proto J4920FL Crowfoot Socket Wrench will prove invaluable. It has an opening type of 12-point flare nut, head style of flare nut, finish of full polish, drive size of 3/8", socket sizes of 5/8", number of points as 12-point, overall length as 1-3/4" and measurement type as SAE.