8 1/2'' overall length x 5 3/8'' wide tank brush, polypropylene block filled stiff black polyester, for cleaning curved surfaces, tanks, vats and gullies. The #D79 offers dense coverage, the only side not filled is where the handle fits. Recommended handles, #ALH27 or ALH8. For a resin set version, see #D79RES. A softer version is available, #D77.