2-3/4 x 1 x 1-13/16" 6.8 x 2.5 x 4.5cm. Designed from the ground up to be a WORKING model, the kit includes a hidden drive. Whenever you're ready, just add the Universal Gearbox and Motor Drive Kit #933-1050 sold separately, to power your pump. Complete instructions and precise engineering produce a great looking, easy to build replica.