About this item TRUE 90 DEGREE CLAMPS - As woodworking corner clamps, holding pieces squared at a perfect 90-degree angle when building cabinets, drawers, boxes, frames, shelves, or other woodworking projects UPGRADE HARDWARE - Rest assured that our M8 threads with brass inserts are not easy to strip. Package includes the box the parts of 4x right angles with measuring indicators on their outer faces, 8x M8 screw nuts able to be tightened by hand, 8x adjusting rack clamps, 8x right angle screw rods ALUMINUM POSITIONING SQUARE - Made of premium aluminum alloy, prevent corrosion and rust. Engraved with metric & imperial, up to 5.5"/140mm scale, which could use as a ruler STRONG FORCE & EASY TO USE - Simply clamping Ours 90 degree clamp set at either outside or inside of pieces to joint, strong enough force to make assembling projects easier, helpful for no matter for DIY or Carpenter. Like an extra set of hands CUSTOMER SERVICE - Aogbra is a professional hardware tool manufacturing company, Your satisfaction is highly valued by us, If you have any questions about our clamping square, please don't hesitate to send messages