Proteus S boxmount seatpedestal. Slideable. Stroke 110 mm (fore-aft) Height 54 mm. Surface boxmount plate 320x300 mm (WxD). Effective size mounting plate seat 320x350 mm.(WxD) with prepared 9 mm slots, countersunk at bottom side, template 4-square 120-408 mm. Locking handle at the side, STS 316 mirror polished. Axles and mounting plate STS 316, brushed. Other parts aluminum anodized.