Drive - Quad Rear Template Home / Uncategorized / Twinza – Twin Fin Template Increases speed, drive and holding power when paired with one of our Upright Twin sets. Increases Speed Increases Drive Increases Holding Power Solid Glass Construction CNC Precision ~ SPECIFICATIONS ~ BASE 68.8 mm (2.71 inch) HEIGHT 74.9 mm(2.95 inch) RAKE 40.89° Buy Now Fins Twinza – Single Tab – Glass $50.00 Buy Now Glass. Single Tab.