The 05.17.254 is a 5.4mm hex stand-off type-B Male to Female Spacer, made of steel with yellow zinc-plated Cr(VI)-free finish, UNC 4-40 thread 1 and M2.5 thread 2 size. Designed according to DIN 1.0718 (material) and 8μm (A3G) DIN 267 (plating) standards.