Rings at base provide quick SAE identificationLarge hard stamped part number and size on both sides of socket for easier visibility to socket sizePackaged in patented slide rail for easier positioning of sockets - internal slide rail eliminates interference / ball bearing retentionEntry angle guides fastenerTurn down at base of socket provides grip surface to pull sockets off ratchets13 Piece 3/8" Drive 6 Point Standard SAE Socket Set includes 1/4" - 1" Standard Sockets packaged on a clip rail. Entry angle guides fastener. Serrated depth as deep as the fastener. Large hard stamped identification. Double line to easily identify SAE vs. metric sockets. Made of 6130 Alloy steel and full polish nickel chrome plated. 
