5.556mm 6.350mm 7.937mm Steel Grinding Ball/Drilled Steel Ball for Special Valves, Ball Transfer Units Shandong Jinnai International Trade Co., Ltd. Base Info Description Pre：6.42mm Carbon Steel Ball AISI1010-AISI1015 Stainless Steel Bearing Ball AISI304 AISI316 AISI420 AISI440 Carbon Steel Ball Chrome Steel Ball with All Sizes Next：3.969mm 4.763mm 6.35mm Chrome Plated Drilled Steel Ball for Ball Transfer Units, Conveyor Belts
