MKS(三ヶ島) ペダル 日本製 ラムダ [Lambda] 左右セット

Are these easily removable? Someone said they were removable and someone else said no - which is it?

My stock peddles are 4x4 in and stick out from crank arm 4.25 in. what dimensions for lambda peddles?

Does it have quick release?

Will these fit a bike that requires 1/2" pedals?