Description:
The cap is made of aluminium and beautifully finished and is a perfect match for your Leica E39 M lens including Leica M Summicron 50mm/f2, Summaron 35mm/f2.8 etc.Please make sure the cap fit your lens before placing the order. 
Here are some of the lens examples that can use the cap:
Summicron M 50mm f/2(1st- 4th Version but be alert that it doesn't fit Summicron M 50/2 with incorporate Hood);
Summicron M 35mm f/2(1st - 3rd version);
Summilux M 35mm /1.4 pre-A;
Summaron 35mm M f/2.8;
Elmar 50mm f/2.8;
Elmar 50mm f/3.5;
Elmarit 90mm f/2.8;
Elmar 135mm f/4 and etc 
◆Package includes:
1 x E39/L39/M39 Lens Cap
Note: This isn’t original accessory, just third-party item.