Arrow Fastener Arrow T55BL Steel Manual Stapler T50 Stapler Bottom loading magazine saves time and hassle Visual refill window shows the user if they have staples loaded Chrome plated steel construction with soft rubber grip handle Uses Arrow T50 Heavy Duty Staples up to 9/16" (1/4", 5/16", 3/8", 1/2", 17/32" and 9/16")