Circular aluminum disc, centrifugal tube clamp for all our rotary mixers Three specifications RM Holder 1：Micro-tube holder, suits 48 of 10-14 diameter tubes RM Holder 2: Test-tune holder, suits 20 of 15-20 diameter tubes RM Holder 3: 50ml centrifuge tube holder, suits 12 of 25-35mm diameter tubes
