Lot of Synthware F304500/250/100 Heavy Glass Round Flasks 24/40 500/250/100mL

Lot of 3 Synthware / Kemtech F304-series heavy-wall single-neck round-bottom flasks including F304500 500 mL, F304250 250 mL, and F304100 100 mL, each with ST/NS 24/40 standard taper joint for organic chemistry, synthesis, reflux, distillation setups, rotary evaporation receiving / boiling flask use, solvent removal, crystallization, heating mantles, reaction workups, and general laboratory glassware applications. Sigma lists these as borosilicate glass, round-bottom, single-neck flasks; the 100 mL, 250 mL, and 500 mL variants are all 24/40, and Synthware describes the line as heavy wall design, hand-blown from tubing for uniform wall thickness.