Found in numerous sizes from 7mm wide to 12mm wide. By far the most popular are the 9x3 (small) and 9x4 (large) hook arms.

Popular arm of the 60’s and 70’s, usually 7mm wide but 8mm was used on some European vehicles.

Used on BMW Series 5 and 6 for limited years. It first appears the same as the standard pinch, but the blade is connected in a totally different manner. Pinch the tabs and slide the blade forward to remove.

15mm wide saddle. Two tabs are pinched together and the blade swivels off the front of the arm.

22mm wide saddle. The standard width for most arms of this style. Currently used on Mercedes SL and S Class.

(Formerly Narrow Top Button) - 19mm wide saddle. A slimmer version of the Top Button used by Audi, Porsche, and Volkswagen.

15.7mm wide saddle with slots in the side of the arm to prevent the blade from falling out the bottom. Currently used on Prius, some Mazda models and Lexus NX.

Only used on limited models of Audi and Mercedes.

Actually incorporates two methods of
attachment... Roc-Loc and Pinch Tab. Used on 2005 to 2011 Audi A6.

Only used on some Mercedes-Benz models starting in 2015.

It looks like a Side Lock (SL) arm, but the saddle on this arm is only 17mm wide. It is only used on some BMW models.

The blade swivels on the pin and a side lock tab holds the blade on the pin. This version has a 22mm saddle. A smaller version has a 17 mm saddle.