The Gray Tools 25-pc 1/4" Drive Insulated Socket Set, No. 15025-I, includes 12-point SAE sockets ranging from 3/16" to 9/16" and 6-point metric sockets from 4mm to 15mm. The sockets are stored in a dual-color foam organizer with imprinted size markings on the top layer for quick identification. Each socket is individually insulated to 1,000V and tested to 10,000V, in compliance to ASTM F1505 standards. Insulation features an orange top insulation layer (orange), and a second layer (yellow) that also serves as a visual safety indicator: should the yellow layer be visible through the outer orange layer, the tool is no longer safe and should be discarded. Made in the U.S.A.