diff --git a/include/cstrike/Interfaces/IVModelInfo.h b/include/cstrike/Interfaces/IVModelInfo.h
index a8cce2c..cf20856 100644
--- a/include/cstrike/Interfaces/IVModelInfo.h
+++ b/include/cstrike/Interfaces/IVModelInfo.h
@@ -1,5 +1,22 @@
 #pragma once
 
+#define MAXSTUDIOBONES 128
+
+#define BONE_USED_MASK 0x7FF00
+#define BONE_USED_BY_ANYTHING 0x7FF00
+#define BONE_USED_BY_HITBOX 0x100
+#define BONE_USED_BY_ATTACHMENT 0x200
+#define BONE_USED_BY_VERTEX_MASK 0x3FC00
+#define BONE_USED_BY_VERTEX_LOD0 0x400
+#define BONE_USED_BY_VERTEX_LOD1 0x800	
+#define BONE_USED_BY_VERTEX_LOD2 0x1000  
+#define BONE_USED_BY_VERTEX_LOD3 0x2000
+#define BONE_USED_BY_VERTEX_LOD4 0x4000
+#define BONE_USED_BY_VERTEX_LOD5 0x8000
+#define BONE_USED_BY_VERTEX_LOD6 0x10000
+#define BONE_USED_BY_VERTEX_LOD7 0x20000
+#define BONE_USED_BY_BONE_MERGE	0x40000
+
 class model_t;
 
 class IVModelInfoClient {