Rock Crusher Briggs & Stratton Gas-Gold Ore-11" Drum 2-1/2" Infeed-IN STOCK!!!This new Rock Crusher from K&M Krushers. These crushers are the next generation of crushers. All of the critical parts are cut out with a CNC Laser cutter to insure everything is square and precise. The bolts & nuts that hold the hammers and mount your motors are schedule # 8 alloy. Your new K&M Krusher features a 11" Drum with a 2 1 2" Infeed Tube. The Hammers are a Rockwell Hardness of 62 on the outside and #58 on the inside turning your 2 1 4"