Christmas Opening Hours
Please be advised that Allen Brothers will close at 15:00 on 20th December and reopen on 6th January.
Orders placed during this period will be processed upon our return.
Wishing you a Merry Christmas and a Happy New Year!
Shop by boat
Single Person Dinghy / RS Aero / Blocks / 20mm dynamic blocks
Our go-to low friction, fast rolling, small pulley. It’s lightweight and strong, making it ideal for dinghies, windsurfing, kitesurfing, paragliding and anything else that runs smaller diameter lines.
Available with a wide range of accessories and features to suit most control line applications.
Dynamic Bearings - Twin rows of stainless steel ball bearings running on a stainless steel axle provide superior rolling speeds and durability when compared to plastic alternatives.
Ultra-Strap – A stainless steel strap which holds the block together and provides a strong, reliable and rope friendly attachment point.
Becket – The hole through the middle of the block can be used as a tying off point (becket).
Maximum Working Load – If exceeded the block may not perform as designed.
Breaking Load – The load at which a major block failure is likely to occur.
| SKU | Title | breaking load kg | fixing hole centres mm | maximum line diameter mm | maximum working load kg | shackle pin mm | Length mm | Weight g | Price | |
|---|---|---|---|---|---|---|---|---|---|---|
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A2020 | 20mm Single Block | 540 | - | 6 | 115 | - | 37 | 10 | £13.80 |
 |
A2020HL | Single High Load | 540 | - | 6 | 250 | - | 37 | 17.5 | £35.09 |
 |
A2020SC | Single With Swivel Head | 350 | - | 6 | 115 | 4 | 54.82 | 15.4 | £35.02 |
 |
A2020Tii- | Single Tii-On | 540 | - | 6 | 115 | - | 29 | 8 | £13.80 |
 |
A2022 | Double | 600 | - | 6 | 225 | - | 48 | 31.6 | £35.09 |
 |
A2022Tii- | Double Tii-On | 600 | - | 6 | 225 | - | 29 | 15.6 | £37.72 |