Highlights: Dual Purpose Attacker All steel construction lasts and lasts Shoots both flat and round crown staples Grooved driving blade Jam resistant mechanism Short span, easy compression handle Chrome finish resists wear and tear Grooved guide ensures perfect stapling Uses T20 staples available with: (catalog id: 40464760 - 5/16" flat), (catalog id: 40464771 - 3/8" flat), (catalog id: 40464782 - 1/2" flat), (catalog id: 40059596 - 3/8" round), (catalog id: 40059600 - 7/16" round), (catalog id: 40059611 - 9/16" round)