The original malleable cast iron bar clamp with an inline wood handle was the world s first sliding arm bar clamp. Clamps with traditional wood handles are still available and quite popular. Now many models are also available with composite plastic handles as well as with T-bar (sliding pin) handles. Many of these clamps have also been fitted with pressure pads that are easily replaced and allow for replacement of damaged spindles. These clamps are available in a wide variety of sizes.