Careful magnet stirring - even in narrow neck flasks. The magnetic stirrer bar is held in a flexible rotor clamp within the container and can be adjusted to be positioned just above the base. When the magnet stirrer is switched on, the stirrer bar provides a controlled, gentle stirring action. The support rod does not turn, the grip-seal between rod and stopper/cap remains durably gas-tight.•support rod 250 mm long with PVDF rotor. Temperature resistant up to 160°C, sterilizable. For 6 mm or 8 mm dia. magnetic stirrer bars. Silicone grip-seal stoppers for NS 19/26 and NS 29/32. Grip-seal screw caps: GL25, GL 32. Grip-seal NS adapters for 19/26 and 29/32.