J.I.C. Locating and Positioning Blocks: Stilson manufactures precision locating and positioning blocks. Horizontal and vertical blocks are sized, drilled and tapped. Tool Block Clamps, T-Nuts and Keys: These heavy duty clamps are designed to securely hold a tool block to a dovetail slide. T-nuts and keys are designed for accurate location and clamping of tools. Rest Pads and Bushing Plate Stops: Stilson rest pads and bushing plate stops come in a variety of shapes and sizes. They are black oxide, carburized, hardened and ground to meet the most precise requirements.