Durable steel closed ring with connected boss head great for connecting to any retort stand and rod.
Titration Lab Kit - 50ml Burette, 23 (60cm) Rod, 8x5 Heavy Base
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Ring Stand Rods at Thomas Scientific
Clamps & Bossheads - hBARSCI
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EISCO
Ring Ray Clamps
Eisco Labs 7.5cm diameter ring with boss head clamp