Tiller arms are available in cast 70 manganese bronze or investment cast stainless steel. Bronze is noted for strength and resistance to work-hardening (becoming brittle). Stainless steel is noted for unsurpassed resistance to corrosion. Bores are precision-machined to ensure compatibility with rudder posts. Clevis pin holes are drilled to precise tolerance to prevent slack and vibration in the steering feel. All length dimensions shown in part titles or tables are measured from center of bore to center of clevis pin hole. This allows easy steering ratio calculations. Every tiller arm comes complete with stainless steel clamping fasteners and nylock nut.