You can see all the steps involved in designing this object on Onshape.

https://cad.onshape.com/documents/3b421bfd404fd0d617a1b2ae/w/29a6c1add510295dccb26a8b/e/52d4c6a93e5d707dc85be75b?renderMode=0&uiState=65c9d43ccd8bcc3c255d3c56