The DeSantis Clip Grip(R) #7 is designed to fit round butt "J" frame revolvers only. It's built of a glass reinforced engineering grade polymer that's almost as strong as aluminum. The sharply checkered panels allows for continuous gun control while shooting. The T07 allows the operator to tuck the revolver inside a boot or waistband when it's not feasible to use a holster. The Clip Grip(R) can still be used with most holsters.