Butler Creek Multi-Flex Flip Open Scope Cover Eyepiece Size 09-09A By Butler Creek Product Overview now offers Butler Creek Flip Open Scope Cover Eyepiece Size 09-09A. The Butler Creek Flip Open Scope Cover is a great choice to protect your scope. The Butler Creek Flip Open Scope Cover makes an airtight seal to prevent the elements from distorting your optics. The Butler Creek Flip Open Scope Cover Eyepiece Size 09-09A fit most scopes with a 37.7mm objective. Fits 37.7mm objective Durable hard plastic construction Airtight seal