Snap-on Tools 23pc SAE Metric MASTER Reverse Ratcheting Wrench Set SOXRRSET1BGA Snap-on Tools USA NEW 23-Piece SAE & Metric. MASTER Reversible Ratcheting Combination Wrench Set with GREEN Foam Organizer. SAE: 1/4″ up to 3/4″. Metric: 6mm up to 19mm. SOXRR8A = 1/4. SOXRR10A = 5/16. SOXRRM6A = 6mm.