Precision Machined Brass and Anodized Aluminum Ruler Stop Fence for Machinist Rules 7/8" to 1 1/8" RS With a ruler stop you can now convert any steel rule into a precision marking tool The single machines knurled brass knob allows quick adjustments for depth, parallelism and squareness Precision machined from brass and anodized aluminum Will accept rules from 7/8" to 1-1/8" wide with any thickness Overall size is 2 3/8 x 3/4 x 3/4"