Allen 20mm Light Stand up Block Select (See Table Below):AL-4710 20MM MICRO BLK: THROUGH DECK - EACH This wheel measures 365mm (14

This wheel measures 365mm (14

B: 83mm (3 1/4")

even after the mast has been stepped

Maintains continuous protection during sleeping hours

Allen 20mm Light Stand up Block Select (See Table Below):AL-4710 20MM MICRO BLK: THROUGH DECK - EACH This wheel measures 365mm (1420mm Light Stand Up Block The Allen 20mm dynamic ball bearing block is simply the best designed and engineered micro block on the market. Line friendly soft contours and articulation, Stainless steel cheeks and inner bearing systems handle maximum loads, Spec Sheet Part Description Length mm Line Dia. mm Shackle Pin mm Break Load Kg. MDL Weight gm RRP Inc VAT Unit AL 4710 Light weight stand up 34 4 6 350 105 19 20. 38 EACH