Hi. I own several brands of bar and ratchet bar clamps and finding reliable movement mechanisms has been an issue with all size clamps. The 4-1/2" clamp has bar flexibility as an added issue which this Dewalt clamp has solved. This is the only 4-1/2" clamp I've found that has no bar deflection when clamped. In addition the spring arm is above the fixed arm which seems to make the spring arm more robust. The head and tail are also small enough to fit into tight spaces. I bought enough to get free shipping and therefore it is a good deal too.