MASTER AIRSCREW 20 X 6 PROP C SERIESRobust propeller for glow engines 1.2cc through 2.11cc. Unique scale look for WWI and WWII Model Aircrafts. Available in sizes 16" to 20". Crafted from Glass Fiber Reinforced Composite. Propeller diameter 20" / 508mm Propeller pitch 6" / 152mm Hub thickness 7/8" / 22.2mm Shaft diameter 5/16" - 3/8" / 7.94mm - 9.53mm * Propeller Weight 5.86oz / 166.1g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black