Straight: This is a single Shock Tab for use when you have no alternative. It is short, 1 1/8" from mounting surface to shock axle centerline but when space is tightest this may be the answer. It will fit 90% of all shocks available but will be tight. These are 1/4" thick Steel. Curved: This is a very common variation of the basic shock tab. We find it mostly used for shock hoops and with tube chassis work, it has a 1.75" tube mounting bottom but can easily be used anywhere with a little adjustment with your grinder, .25" thick for strength.