This lockable brass sliding block is the perfect addition to your steel ruler set. With a fit square, it ensures precise measurements every time. The block can be easily locked in place, providing added stability and accuracy during use. Crafted from high-quality brass, this ruler locator is durable and built to last. It's suitable for use in a range of industries, including DIY, woodworking, and metalworking. The block is designed to fit square on your steel ruler, making it a versatile tool for a range of measuring tasks. Whether you're a professional or a hobbyist, this lockable brass sliding block is an essential addition to your toolkit. Ruler not included.