This is a replacement trailer disc brake caliper slide pin guide bolt which fits Kodiak trailer disc brake calipers (Size 225 and 250). The Manufacturer's part number is DBC-MHGB. These sliders pins are 100% Stainless Steel and will never rust. They come with thread locker pre-applied. The slider pins use either a 5/16 Allen wrench or a 1/2 socket. The thread size is M11 x 1.5. This slider pin will fit Kodiak's disc brake sets 3,500lb through 7,200lb.