http://vivekengineers.net/pi…/suction-cups/deep-concave.html
Deep Concave
| DCF - Deep Concave Friction (65–110 mm/2.6–4.3") | 
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The
 DCF design is suitable for flat, convex or concave surfaces, e.g., such
 as those encountered when handling metal sheets in later stages of a 
press line. The suction cups have a thin design that easily follows the 
curved metal sheet. >>More Details<< | 
 
