Improved grip and piston protection Paper insert inside the piston holder increases friction to prevent the plunger from slipping and reduces the risk of damage to the piston during use. Versatile, multi-equipment support Includes a stable base, piston clamps, and both large and small rings. Compatible with cup glasses, test tubes, flasks and other common laboratory apparatus, so one unit adapts to a range of experimental setups. Precise, adjustable positioning Locking knob lets you quickly change the height and lateral position of the rings to match experimental requirements, helping maintain alignment and measurement accuracy. Stable and safer operation Sturdy base and secure fixing device keep equipment steady throughout procedures, lowering the chance of spills, breakage, or accidental movement. Key attributes Function: holds and secures pistons, glassware and similar experimental items while protecting components and improving handling. Compatibility: designed for cup glasses, test tubes, flasks and other lab equipment; includes large and small ring sizes for different diameters. Adjustment: height and position adjustable with locking knob for repeatable setup. Safety/performance: increased friction for secure holding, plus a firm base and fixing mechanism to reduce risk during experiments. Typical applications Holding a test tube steady during reagent addition or mixing to prevent slippage and maintain accurate delivery. Securing a flask or cup glass during titration or observation to keep apparatus aligned and stable. Supporting pistons or assemblies during assembly/disassembly or routine maintenance to avoid piston damage. Clear, practical design for reliable, repeatable lab use without compromising equipment safety.