For external halyard poles - Cap style truck - Construction: Cast aluminum - Pulley: Cast nylon on 1/4" stainless steel axle (1-1/2" outside diameter on OTH, OT1, OT25, OT35; 2" on OT2, OT3, OT325)Max halyard diameter: 5/16"Truck: Secured by stainless steel set screws (one 1/4 ...For external halyard poles - Cap style truck - Construction: Cast aluminum - Pulley: Cast nylon on 1/4" stainless steel axle (1-1/2" outside diameter on OTH, OT1, OT25, OT35; 2" on OT2, OT3, OT325)Max halyard diameter: 5/16"Truck: Secured by stainless steel set screws (one 1/4"-20NC on OTH; three 5/16"-18NC on OT1, OT2, OT25, OT3, OT325, OT35)Ornaments: Accepts spindle threading of 1/2"-13NC. Secured by 1 stainless steel pan head screw (size 10-32)Can be supplied with other threading sizes if desired - Call (262) 783-4800 x10Also need Flapole Halyard? You can find it here.