This toothbrush-style scratch brush has a 0.003" brass bristle and a plywood handle in a curved design for knuckle protection. The brass bristle, hand-laced with stainless steel wire, remains secure even in wet environments if the wooden handle expands or contracts. Hand-laced brushes are the premium brushes in the industry. Each fill tuft is tied into position by hand, resulting in a superior quality brush with maximum fiber retention. greater bristle density than staple-set brushes. This useful brush has a 3 x 7 row configuration, with a 7/16" trim, and a brush face of 1-1/2" x 1/4". The handle length is 7-3/4" x 7/16" wide.