Abstract: A shaving brush is disclosed that can accommodate brush knots having different diameters. The brush comprises a handle, a collet, and a collar, among other components. The collet includes an upper end which includes a bore with an inner diameter for accommodating a brush knot of a given diameter. The collet also includes a lower end which fits into the handle. The collar fits over the collet and engages the handle, to trap the collet in place. Different collets have bores with different inner diameters, but the collets all have the same outer diameter. Brush knots with different diameters are thus used with a given collet, and all collets can be used with the same brush handle.