Features and Benefits Shallow broach to standard nut depth Knurled ends provide grip surface Turn down at base of socket provides grip surface to pull sockets off ratchets Large hard stamped part number and size on both sides of socket for easier visibility to socket size Packaged in patented slide rail for easier positioning of sockets - internal slide rail eliminates interference / ball bearing retention13 Piece 6 Point Deep Metric Socket Set includes: 4-5.5mm 6-15mm Deep Sockets packaged on a clip rail. Entry angle guides fastener. Serrated depth as deep as the fastener. Large hard stamped identification. Knurled line to easily identify SAE vs. metric sockets. Made of 6130 Alloy steel and full polish nickel chrome plated.