Emtek Stainless Steel Stuttgart Lever Handle with Square Rosette - E672 AMSEC C3 There is a piece inside

There is a piece inside which locks the thumbturn into the lock itself

25" H x 12

while attempts to lock the bolt from the inside using the thumb turn will not succeed

Size: M5 x 50mm

Emtek Stainless Steel Stuttgart Lever Handle with Square Rosette - E672 AMSEC C3 There is a piece insideEmtek's collection of Stainless Steel modern lever handles are available with several rosette styles. Emtek's modern collection of door hardware provides the clean and simple look you're after for your modern or urban decor. Be sure to order your Emtek Deadbolts in coordinating styles and finishes. Part Numbers for Emtek Stainless Steel Stuttgart Lever Handle with Square Rosette Passage Set S10003STT Privacy S20003STT Dummy S30003STT Emtek Stainless