HES 4500 Tech Tips It seems like every manufacturer of mortise locksets uses a different offset, or positions their deadlatch in a different place. This can make it difficult to align the strike body to the lockset. To address this challenge, the 4500 electric strike opening can be adjusted to accommodate almost any mortise lockset, making installation a snap. The 4500 series comes with an assortment of filler blocks which are installed in the strike body. These filler blocks depress the deadlatch, and do not interfere with latch operation. The 4500 even includes a filler block for cylindrical locksets. This filler block covers up the blank spot in the strike opening, while leaving an opening for the latch in the center of the strike body. To learn more about this versatile, fire rated electric strike, please visit the 4500 product page.