7 Series blocks offer medium sized cruising and racing yachts Delrin(tm) and Delrin(tm) Ball Bearing sheave blocks with a stunning combination of strength and performance. Available with highly polished Stainless Steel or Black Hardcoat anodized Aluminum cheeks that are reinforced with large Stainless Steel V-Straps and head posts. All of our 7 series blocks work with convenient Universal adapters and contain our three-way head that allows for free swiveling or front/side set positions. Choose from our 7 series with Delrin(tm) sheave with plain bearing (704 series), SS cheeks with Delrin(tm) plain bearing sheaves (705 series), or Ball bearing sheaves (706 series).