Windex® 15"-Davis (3150) $95.95 Windex® 15"-Davis (3150) $95.95 MFG : #3150 Description Windex® 15"-Davis (3150) 15" (38 cm) wind vane with sapphire jewel bearing. Adjustable tacking arms Reflective vane tabs for high visibility, day or night Wind-tunnel tested to speeds of 80 knot