If the product you need is not available at the pickup location, you can choose another delivery method at checkout. Note that in-store prices may differ from online prices.
Height measurements are from top of base to center of ring:
Super Low, .550" (13.9mm).
Low, .650" (16.5mm).
Medium, .770' (19.55mm).
High, .900' (22.86mm).
Super High, 1"(25.4mm).
Extension Ring Set (Extension) contains one standard ring, and one front extension ring that offsets ring spacing .650" (16.5mm).