TouchDown 1/4 inches to 1 inches CTS Tube Hanger Pipe Clamps by Sioux Chief. 5 bases, 5 bridges, 5 screws/bag. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading materials using up-to-date equipment, it ensures everlasting reliability and enduring value. This product is distinguished by total quality assurance, unsurpassed by anybody else.Releasable locking mechanism allows for variable clamping tension for expansion and contraction,Provides 1/4 inches stand-off from mounting surface,Plenum safe model meets ASTM E84 25/50 flame/smoke spread and UL-94 V0 flame ratings,Acoustical options are not plenum-rated,Perfect when various pipe and tube sizes are used