The Masterfit T-Bolt Kit includes 4 replacement adaptors required to fit into the C-Channel of the range of Rhino-Rack Roof Boxes of the Vortex Crossbar and Pioneer Accessory Bar. The Masterfit T-Bolt is engineered to allow for different placement of securing locations depending on the space between your roof rack bars.• Masterfit T-Bolt Kit includes 4 replacement adaptors
• T-Bolts fit into the C-Channel of the range of Rhino-Rack Roof Boxes of the Vortex Crossbar and Pioneer Accessory Bar
• T-Bolt allows for different placement of securing locations depending on the space between your roof rack bars