CALIBER LOWPRO GLIDES WIDE 11.5" WIDE 4/PK EXTENSION SET - 42-50531Caliber glides reduce friction and wear between carbides and trailer surfaces to make loading and unloading easier, and more efficient Low profile design allows trailers to be used for multiple purposes Now available in three different sizes 6, 9, and 11. 5 The best glide option for single, double, and triple carbide runners Updated design provides an increased working surface Additional mounting locations provide increased versatility LowPro Glides