Delrin Advanced Forming Stake 1.5" for Synclastic Raising. Used for synclastic and anticlastic shaping. It is less expensive than steel stakes, the delrin gives full support while forming. The 1.5" (1-1/2" or 38.1mm) refers to the differences in the radii of each the curves in the stake. They progressively get larger by 1.5". The overall size of the stake is 9-3/4"L x 1"W x 1-1/2"H. The delrin mallets with cross peen are excellent choices to use with this stake.