![Harken 29mm Triple Carbo Air Block w/Swivel [344]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/harken-29mm-triple-carbo-air-block-w-swivel-344.webp)
Description
29mm Triple Carbo Air Block with Swivel
Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming.
Specifications:
- Sheave: 29mm / 1-1/8in.
- Length: 73mm / 2-7/8in.
- Weight: 74g / 2.6oz
- Shackle pin: 5mm / 3/16in
- Maximum line: 8mm / 5/16in
- Maximum working load: 449kg/ 990lb
- Breaking load: 907kg / 2000lb
![Ronstan Series 15 Ball Bearing Utility Block - Single Block, Loop Head [RF15101]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/ronstan-series-15-ball-bearing-utility-block-single-block-loop-head-rf15101.webp)
![Lewmar 90mm Synchro Block - Single[29929001BK]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/lewmar-90mm-synchro-block-single-29929001bk.webp)
![Ronstan Series 40 Orbit BB Quin Block w/Swivel Shackle [RF48500]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/ronstan-series-40-orbit-bb-quin-block-w-swivel-shackle-rf48500.webp)
![Ronstan Series 55 Ratchet Mount Orbit Block - Fiddle Becket Swivel [RF56510]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/ronstan-series-55-ratchet-mount-orbit-block-fiddle-becket-swivel-rf56510.webp)
![Ronstan Series 20 Ball Bearing Block- Single, Stand-Up Loop Top [RF20141]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/ronstan-series-20-ball-bearing-block-single-stand-up-loop-top-rf20141.webp)
![Ronstan Series 50 All Purpose Block - Triple [RF51300]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/ronstan-series-50-all-purpose-block-triple-rf51300.webp)