This pair of bolt-on climbing holds are spherical slopers with a 3-inch diameter. They have a flat bottom.
3/8-16 x 1-1/2" Indoor Rated Allen Head Bolt
3/8-16 x 1" Indoor rated allen head bolt
3/8-16 x 2" Indoor rated allen head bolt
3/8-16 x 2-1/2" Indoor rated allen head bolt
3/8-16 x 3" Indoor rated allen head bolt