b"Air Runner BlocksRunners are used on running backstays of offshore boats to adjust mast bend for different wind conditions. Integrated sideplate bails and recessed cotter key help produce a smooth design that wont snag lifelines. Foam padded Block Socks easily install over Air Runner blocks to protect your blocks, deck, and crew.About Black Magic Air blocks: see feature pages at beginning of this section.3224 3239 30353238 3252 3036 Sideload bearing strips dampen 3251 3260 3037 rig vibration.3259 3265 30383264Block SocksBlock SocksPart No. Fits3035 3224/3238/32393036 3251/32523037 3259/32603038 3264/3265Runner BlocksSheave Clevis pin Max line Maximum BreakingPartLength Weight working load loadNo. Description in mm in mm oz g in mm in mm lb kg lb kg57 mm 3224Single2 1/4573 3/8864.421253/8101/2122500113450002268 75 mm3238Single2 15/16754 5/811810.162881/212.79/16500022684536 1410000 3239Single/becket2 15/16755 3/414611.23181/29/161450002268100004536 12.7100 mm 3251Single3 15/161006 3/16157174815/815.95/816750034021500068043252Single/becket3 15/161007 9/1619319.125425/815.95/8167500340215000 6804 125 mm32594 15/167 11/168443/419110004990220009979 Single12519529.763/419 3260Single/becket4 15/161259 1/22403/4193/41911000499022000 33.529509979 150 mmSingle5 15/161508 3/42213/411500068043000013608 326450.6414361925 32655 15/1615010 13/1627556.7216083/419251500068043000013608 Single/becket1 Crossover BlocksCrossover blocks provide a cleaner, more efficient deck. These easy-to-install blocks mount behind the stopper bank on each side of the cabin house and can route any line to the winch on the opposite side. Blocks feature built-in risers and sculpted backing1984plates. The large, strong bases protect 1981cored decks. Use the 1984 for boats to 11.5 m (38') and the 1981 for boats to 15 m (48').Sheave Base Max line Maximum BreakingPart Height Weightworking load loadNo. Description in mm in mm in mm oz g in mm lb kg lb kg1981Crossover2 3/1656661 7/162277/16123000136160002722 2 5/8368 1984Crossover1 3/4442 1/16521 1/44.211910200090740001814 323/8 Fastener included. 57"