QWORK Glass Stopper, 2 Pcs Hex Head Glass Hollow Stopper For 24/40 Outer Joint

Hex Head Borosilicate Glass, 24/40 outer joint, hex head design, has good sealing, durable to use. Plastic Clamp The clips are used to hold ground glass joint glassware, smooth surface won't corrode or scratch the glass. Package includes 2 Pcs Glass Hex Head Hollow Glass Stoppers with 24/40 Joint + 10 Pcs #24 Plastic Splice Clamps, enough to meet your needs. Borosilicate Glass, 24/40 outer joint, hex head design, has good sealing, durable to use. Plastic Lab Glass joint Clips can withstand temperatures from -40°F to 212°F, used for a long time.