The very best and safest way to prepare copper pipe and copper fittings. Long lasting double stemmed brushes clean quickly. Quick thorough tubing prep with patented tungsten carbide abrasive technology.Works 3 times faster and lasts 4 times longer than conventional tools. Patented ratchet handle makes jobs possible in all tight spaces. Eliminates the risk of scrapes or flux burns. Size 15mm. Use 15mm pipe and fittings. Display pack. Watch Monument CopperKey video on You Tube .Buy MON2915 from Amazon Marketplace.