The Yost 6 PC. Clamp set features our line up of various clamps for your shop. 2 PCS of the Yost 13012-hd clamps. 2 PCS of the Yost spring clamps. 2 PCS of the Yost Ratcheting clamp. These clamps all feature our innovative “I†beam design for superior clamping pressure and durability. Imported.