The "15 inch Thumb Trigger Syringe Pole Kit" is an assembly that contains a Thumb Trigger Syringe Pole " that has the ability to interchange the 3cc and 12cc Syringe assemblies in one kit. You simply unscrew the long steel rod plunger, then unscrew the undesired or empty 3cc or 12cc syringe assembly from the aluminum pole, tighten the desired or full syringe onto the pole, replace the long steel rod by placing it back through the aluminum tubing, threads first, and hand tighten it to the plunger inside of the syringe. The kit also comes with a thread protection head, to keep your pole in great working condition even when neither syringe end is in place, and a draw rod plunger to make it easier to load syringes. The Thumb Trigger Syringe Pole Kit ", is available in 15 and 30 inch kits and sells for $129.00