Rapid 26/8 26/8 90003 Staples, High Capacity, 5/16", Box of 5000. Fits Rapid staplers: S50, HD12/16, 100E, K1 and K2. Super-strong staples are perfect for high-capacity stapling of up to 50 sheets. Chiseled tips guarantee penetration through paper. Each box contains 5,000 full-strip staples with 5/16" (7.94 mm) leg length. Staples operate best when used with Rapid staplers but also compatible with many high-capacity staplers.