Available in different sizes:
61441 - 15" with 9 pins.
61442 - 18" with 11 pins.
61443 - 24" with 15 pins.
Size of pin : 1-3/8" projection and ball is 3/8". Back plate is 1-1/2" x 1-/2" and the total projection from the wall is about 2-3/4".

Available in custom sizes