There a people that are not very sure if the adapters will work properly with their lenses or if it's a good idea screw the polarizer directly in the lens, for these people I changed the Return Policies.
Refunds are offered if the product are defective (shipping included).
If the product are returned because the expectations are not met, the shipping cost and PayPal fees will not be refunded.
The products must be returned within 15 days from the date you received your order.
It may take up to 4 business days to process your return after we received your product.
There is no harm in trying...