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 kg 57 mm 3224Single2 1/4573 3/8864.421253/8101/212250011345000226875 mm3238Single2 15/16754 5/811810.162881/212.79/1614500022681000045363239Single/becket2 15/167514611.23181/212.79/161450002268100004536 5 3/4 100 mm3251Single3 15/161006 3/16157174815/815.95/816750034021500068043252Single/becket1007 9/1619319.125425/815.95/81675003402150006804 3 15/16 125 mm3259Single4 15/161257 11/1619529.768443/4193/4191100049902200099793260Single/becket4 15/161259 1/224033.529503/4193/419110004990220009979150 mm3264Single5 15/161508 3/422150.6414363/4191251500068043000013608 3265Single/becket5 15/1615010 13/1627556.7216083/4191251500068043000013608 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 sculpted1984backing plates. 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 3/16562 5/8661 7/163682277/16123000136160002722 1984Crossover1 3/4442 1/16521 1/4324.21193/810200090740001814 56 Fastener included."