The MP & WA Series Safety Clamp are designed and manufactured according to API Spec 7K, equivalent to Varco/BJ Type ●Model: MP-S, MP-R, MP-M, MP-L, MP-XL Size: 2 3/8" to 21" ●Model: WA-T Size: 1 1/8" to 4 1/2" ●Model: WA-C Size: 3 1/2" to 21"