with adjustable arm

It is made of durable mahogany

just like smoke detectors

with a hole in the middle

Rutgerson, RAW Skildpadde blok 50mm buet plade BL222728 with adjustable armThis turtle block with a curved plate is used for line routing on areas of the boat where the surface is curved. It ensures stable directional control and is useful in halyard, trimming and control systems. Brand: Rutgerson Working load: 700 kg Breaking load: 1250 kg Sheave diameter: 50 mm Rope : 4 12 mm Product weight: 133 g Product dimensions: 45 mm 79 mm Packaging dimensions: Gross weight: 0. 02 kg This turtle block with a curved plate is used for