The 30 in. large spiral mixing paddle mixes large batches of thinset, grout, mortar, and other materials. Fits up to a 1/2 in. chuck. 30 in. length provides less strain on users back. Spiral design reduces introduction of air into mixture 30 inch Length creates less strain on the back Mixes large batches of thinset, grout, mortar, paint and other materials Fits up to 1/2 inch chuck Ideal for fast mixing of large batches Long length favored by professionals