Comes as a pair: includes stainless steel 2-in-1 puncture plug/reamer tool, knife trimming tool, 5 each thin, medium, and thick tire worms. CNC Machined from 6061 aluminum. Expanding silica plug fits most MTB, Gravel, and Road handlebars with a larger than 17 mm inside diameter. Supplied with 17 mm, 19 mm, and 21 mm silica plugs to fit different handlebar diameters. Screws into bars using a just a 4 mm Allen key. Plugs and Repairs multiple holes that won't seal with just sealant. Compatible with most open-end grips and drops bars with a 84 mm straight section at the bar end. Weighs 33 g per side (excluding tire worms).