Here's what other sites are saying:
Virtually identical to the Single pulley version, this double incorporates a becket designed to facilitate its use in compound pulley or other mechanical systems advantage systems. | Routinely outperforms other full-sized pulleys. | Available with Gold and Grey sideplates or in Black for tactical use situations. | All SMC NFPA products are third party tested (by Underwriters Laboratories - UL) as required by NFPA 1983 (2001 edition) standards. All SMC NFPA pulleys have the required certification information stamped on the side plate and the user information is enclosed with each item as required by NFPA. | Dimensions: 4.65" x 2.55" x 1.81". Sheave 1-3/8 x 1/2. | Material: Aluminum sideplates & sheave, Ball bearings | Strength: 10,566 lbf 47kN; Becket 4,496 lbf 20kN (3 Sigma) | Specifications: Meets NFPA "L" - Light Use 22kN (12kN Becket). | Accepts ropes up to 12.5mm.
- Tahoe Mountain Sports
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