The mallet is mainly for survivability, but also for the slow.Tri force is mainly for the sheen procs and crit chance but yes also for some attack speed, if you catch the axes in team fights you will be constantly using your Blood Rush, activating tri force as well as giving you bonus attack speed and movement speed. The bezerker greaves do give attack speed, and if your feeling as if you don't have enough attack speed you can sell the greaves to make room for a phantom dancer. I sometimes do it depending on the status of my late games, since phantom dancer will give movespeed as well as attack speed and crit it should balance out not having the boots.

Why do you have Frozen Mallet AND trinity Force?

TF has just been nerfed and will no longer be in any way as useful to him.

Neither items are a very good source of AD as well, this is a borderline bruiser build practically.

Also you have no attack speed until your Trinity Force. o.O

Feel free to ask Questions!