The CRAFTSMAN CMMT45939 is a 308-piece mechanics tool set designed for automotive maintenance, mechanical work, and general DIY repairs. It combines SAE and metric tools in a broad assortment suitable for a garage or workshop.  

Three 72-tooth ratchets cover 1/4-inch, 3/8-inch, and 1/2-inch drive sizes. Their 5-degree arc swing helps operate fasteners where handle movement is limited, while the 1/4-inch and 3/8-inch ratchets use a low-profile head design for improved access.  

The set includes standard and deep sockets, combination wrenches, hex keys, bit sockets, specialty bits, extensions, universal joints, adapters, and spark plug sockets. Tools have a full-polish chrome finish, and molded plastic trays provide organized storage.  

Technical specs

• Brand: CRAFTSMAN
• Model: CMMT45939
• Piece count: 308
• Measurement systems: SAE and metric
• Drive sizes: 1/4 in., 3/8 in., and 1/2 in.
• Ratchets: 3 low-profile, 72-tooth ratchets
• Ratchet arc swing: 5 degrees
• Standard sockets: 75
• Deep sockets: 61
• Bit sockets: 27
• Combination wrenches: 23
• Hex keys: 44 total
• Specialty bits: 42
• Extension bars: 6
• Universal joints: 3
• Spark plug sockets: 3
• Finish: Full-polish chrome  

Also Known As

• CRAFTSMAN CMMT45939
• CRAFTSMAN 308PC Mechanics Tool Set
• CRAFTSMAN 308-Piece Socket and Wrench Set
• CMMT45939 Mechanics Set
• CRAFTSMAN SAE/Metric Mechanics Tool Set

Other features

• Includes both 6-point and 12-point sockets.  
• Low-profile ratchet heads are intended to improve access in confined areas.
• Plastic trays keep the large tool assortment separated and organized.
• Suitable for automotive work, DIY repairs, and general mechanical fastening tasks.
• Covered by CRAFTSMAN’s full lifetime warranty.