4" Tri-Clamp/ Tri Clover Spools Sizes Available: 4" x 2" Tri-Clamp Spool 4" x 4" Tri-Clamp Spool 4" x 8" Tri-Clamp Spool 4" x 12" Tri-Clamp Spool 4" x 18" Tri-Clamp Spool 4" x 24" Tri-Clamp Spool 4" x 36" Tri-Clamp Spool 4" x 48" Tri-Clamp Spool Specifications: Tri-Clamp Size 4" Material 304 Stainless Steel Standard 3A High Polish Spool OD 4" Spool ID 3.834" Flange OD 4.682" Bead Center 4.344" OD = Outer Dimension ID = Inner Dimension Disclaimer to Customer: User assumes all responsibility and | BVV 4" Tri-Clamp Spools.