Both the Sliding T Bevel and Pencils are excellent tools for determining and marking angles, and for making cuts on boards The T-Bevel has a large diameter, flush tensioning knob locks the rule firmly into place, allowing for the rule to slide to precisely the angle you need; easy adjustments too The T-Bevel features a sturdy stainless steel rule with precision-etched black gradations in easy-to-read US and metric units (9 inches; 20cm) The CP216 includes 2 pencils, each with a flat design (it won't roll away!) and 8 black graphite tips, plus 8 extra replacement black graphite tips for 24 total tips. The pencils feature consistently sharp tips that resist breakage and smearing—no razor blade needed for sharpening Power source type: Hand Powered