b'16 mmThe 16 mm is Harkens smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The bearing system uses stainless steel balls in a captive grooved race and has a 113 kg (250 lb) maximum working loadthe highest on the market compared to similarly sized blocks.The 442 uses a spacer and the 404 uses an O-ring to keep the line in the sheave during intermittent loading.The 467 and 484 use a narrow sheave for extremely small control lines and have a ferrule head for soft attachments. They use the same high load ball system. The 484 features a bronze sheave for added durability.Use for:Dinghy control linesSpinnaker pole trip lines Hardened stainless steel inner race Big Boat leech linesOuthauls for maximum strength-to-weight ratio.DownhaulsCunninghamsTraveler controlsHalyards on pramsCutout11 mm (7/16") x 41 mm (1 5/8") 376 39160.3 mm(2 3/8") 404 405368Actual size408 409406 407 36 mm(1 7/16")416Cutout11 mm (7/16") x 35 mm (1 3/8") 41744.5 mm(1 3/4")437 442467421 432 12.7 mm(1/2") 27 mm(1 1/16")Sheave Max line Maximum BreakingPartLength Weightworking load loadNo. Description in mm in mm oz g in mm lb kg lb kg368In-line exit*5/816376.94277/3252501131200544376Forkhead5/8161 1/829.38117/3252501131200544391Hook-in halyard5/8161 5/841.5137/325250113400181404Single**5/8161 1/829.33107/3252501131200544405Single/becket5/8161 1/238.44127/3252501131200544406Double5/8161 11/1643.94277/3254502041200544407Double/becket5/8162 1/8541287/32545020412005445 408Triple5/8161 13/16461.44417/327003181200544 409Triple/becket5/8162 1/4571.5437/3257003181200544416Cheek*5/8161 13/1646.44127/3252501131200544417Single/swivel***5/81646.63187/325250113750339 1 13/16 2 3/8 421Through-deck*5/81660.63187/3252501131200544432Pivot cheek*5/8161 3/835.38117/325250113750339 437Flip- 5/8161 5/1634.75217/3252501131200544op* 442Block/eyestrap assembly*5/8161 3/835.44127/3252501131200544467Narrow ferrule head5/8161 15/3237.44125/324250113750339*4 mm (#8) RH fasteners.**Contact Harken for replacement O-rings HSB340. ***Shackle pin diameter 4 mm (5/32"). 32'