Features and benefitsknurled ends provides grip surface to pull sockets off ratchetslarge hard stamped part number and size on both sides of socket - easier visibility to socket sizepackaged in patented slide rail for easier positioning of sockets - internal slide rail eliminates interference / ball bearing retentionentry angle guides fastenermade of 6130 alloy steel and full polish nickel chrome platedset includes: 4 through 5.5, 6 Through 15mm standard sockets packaged on a clip rail. Serrated depth as deep as the fastener. Large hard stamped identification. Knurled line to easily identify sae vs. Metric sockets.