Will work with older Thule T2/T3 cradle/rack systems where the strap is installed around the horizontal cradle tube. Small holes are approximately 1/2" diameter, 6 small round holes. Large hole is approximately 1" x 1-1/2". Overall length is 10-1/2". Item number is for reference only. High quality urethane rubber construction. This listing only includes 1 rubber piece. It does not include the hard plastic insert.