Borosil® Heavy Duty Retort Base is made with superior heavy steel alloy stand with lead-free powder coating. Heavy Duty base is with rubber linning that give extra stabilty and has Hole in the center for Steel Rod. Available in sizes of 6 "x4", 8"x 5" and 10"x6". In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.